This is a marathon participant-exclusive T-shirt from BOLDER BOULDER (Boulder Boulder). It has never been worn. I think it's quite rare to find in Japan. The women's M size is on the left (pink collar) The men's M size is on the right. Founded in 1979 as a small local 10K, it has since grown into one of the largest and most respected community running events in the world. It remains locally owned and operated. Every year, Memorial Day is celebrated with over 48,000 participants and 70,000 spectators. The finish line is at Folsom Field at the University of Colorado, making it the perfect venue for everyone to gather and watch the pro race and Memorial Day tribute. - Brand: BOLDER BOULDER - Design: Stripes and circular graphics Thank you for looking.